Akytec SMI2-M User manual

akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
SMI2-M
RS485 Multi-Color Display
User guide
SMI2-M_2022_0001_EN
© All rights reserved
Subject to technical changes and misprints

akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
1
Contents
1. Introduction.....................................................................................................................................................2
1.1 Terms and abbreviations .........................................................................................................................2
1.2 Symbols and key words...........................................................................................................................2
1.3 Intended use ............................................................................................................................................2
1.4 Limitation of liability..................................................................................................................................2
1.5 Safety.......................................................................................................................................................2
2. Overview..........................................................................................................................................................4
2.1 Basic features ..........................................................................................................................................4
2.2 Design......................................................................................................................................................4
3. Specifications .................................................................................................................................................6
3.1 Operating conditions................................................................................................................................6
4. Configuration ..................................................................................................................................................7
4.1 Connection to akYtecToolPro..................................................................................................................7
4.2 RS485 interface .......................................................................................................................................7
4.3 Modbus common .....................................................................................................................................8
4.3.1 Safe state.............................................................................................................................................9
4.4 Modbus Slave ..........................................................................................................................................9
4.5 Modbus Master ........................................................................................................................................9
4.6 Modbus Spy...........................................................................................................................................10
4.7 Device settings ......................................................................................................................................11
4.7.1 Display ...............................................................................................................................................12
4.7.2 Displayed value..................................................................................................................................13
4.7.3 Extended control ................................................................................................................................14
4.8 Device status and errors........................................................................................................................17
4.9 Password ...............................................................................................................................................18
5. Installation.....................................................................................................................................................19
5.1 Mounting ................................................................................................................................................19
5.2 Wiring.....................................................................................................................................................20
5.3 RS485 network ......................................................................................................................................20
6. Factory settings restoration........................................................................................................................22
7. Maintenance..................................................................................................................................................23
8. Transportation and storage.........................................................................................................................24
9. Scope of delivery..........................................................................................................................................25
Appendix A. Galvanic isolation........................................................................................................................26
Appendix B. Modbus application.....................................................................................................................27

Introduction
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
2
1. Introduction
1.1 Terms and abbreviations
akYtecToolPro – configuration software
Modbus – application layer messaging protocol for client/server communication between devices
connected on different types of buses or networks, originally published by Modicon (now
Schneider Electric), currently supported by an independent organization Modbus-IDA
(https://modbus.org/)
TTL – transistor–transistor logic
1.2 Symbols and key words
WARNING
WARNING indicates a potentially dangerous situation that could result in death or serious inju-
ries.
CAUTION
CAUTION indicates a potentially dangerous situation that could result in
minor injuries
.
NOTICE
NOTICE indicates a potentially dangerous situation that could result in damage to property.
NOTE
NOTE indicates helpful tips and recommendations, as well as information for efficient and trou-
ble-free operation.
1.3 Intended use
The device has been designed and built solely for the intended use described here, and may only be used
accordingly. The technical specifications contained in this document must be observed.
The device may be operated only in properly installed condition.
Improper use
Any other use is considered improper. Especially to note:
– The device may not be used for medical appliances applied to maintain human life or health, its con-
trol or other effect on them.
– The device may not be used in explosive environment.
– The device may not be used in atmosphere in which there are chemically active substances.
1.4 Limitation of liability
Our company does not bear any responsibility with respect to breakdowns or damages caused by using the
product in a manner other than described in the Manual or in violation of the current regulations and tech-
nical standards.
1.5 Safety
WARNING
Ensure the mains voltage matches the voltage marked on the nameplate.
Ensure the device is provided with its own power supply line and electric fuse.

Introduction
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
3
CAUTION
De-energize the equipment before servicing. Switch on the power supply only when all
works on the device are completed.
NOTICE
Supply voltage may not exceed 48 V. Higher voltage can damage the device.
If the supply voltage is lower than 10 V DC, the device cannot operate properly but will
not be damaged.
NOTICE
If the device is brought from a cold to a warm environment, condensation may form in-
side the device. To avoid damage to the device, keep the device in the warm environment
for at least 1 hour before powering on.

Overview
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
4
2. Overview
SMI2-M is a universally applicable LED display that receives data from a network over RS485 interface using
Modbus RTU / ASCII protocols and can be operated in slave, master or spy mode.
For details on Modbus working see Appendix B.
For Modbus protocol specifications see Modbus specifications.
The device can be configured with the configuration software akYtecToolPro (free) over USB (Sect. 4). The
software is available for download on akYtec.de.
2.1 Basic features
– Slave mode: receiving data from Master
– Master mode: querying data from Slave
– Spy mode: listening-in to data requested by the Master from another Slave
– Displaying received data according to display settings
– Extended display control
– Display safe state (Sect. 4.3.1)
– Error indication if no master activity or variable cannot be displayed
– Configuration with the akYtecToolPro software over USB interface
– Modification of configuration parameters over Modbus network
2.2 Design
1 - Micro-USB programming interface
2 - service button
3 - two plug positions of terminal block
Fig. 2.1External design

Overview
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
5
Fig. 2.2Hardware block diagram
RS485-TTL converter - converts RS485 network signals into TTL signals used by the microcontroller.
Microcontroller - processes the data received over RS485 network.
Digital display - displays the variable received over RS485 network and error / alarm messages.
VS - secondary voltage source with galvanic isolation hat provides stable power supply and protection
against polarity reversal.
NOTE
When the device is powered from USB, the display brightness is by 50% reduced com-
pared to 24 V power supply.

Specifications
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
6
3. Specifications
Table 3.1 General specification
Parameter
Value
Power supply
24 (10…48) V DC
Power consumption, max.
1.6 W
Display
4 digits with sign, 7 segments
Colors
green, yellow, red
Character height
14 mm
Network interface
RS485
Protocol
Modbus RTU, Modbus ASCII
Mode
Master, Slave, Spy
Baud rate
2.4…115.2 kbit/s
Galvanic isolation to power supply
500 V / 1 min.
Configuration interface
USB2.0 (Micro-USB)
Configuration software
akYtecToolPro
Flash memory write cycles, min.
10000
Enclosure
panel mounting in Ø22.5 mm borehole
Dimensions
48 x 26 x 65 mm
IP Code
front IP65, rear IP20
Application class
III (according to IEC 61140)
Weight
approx. 30 g
3.1 Operating conditions
The device is designed for natural convection cooling. It should be considered when choosing the installation
site.
The following environment conditions must be observed:
−clean, dry and controlled environment, low dust level
−closed non-hazardous areas, free of corrosive or flammable gases
Table 3.2 Operating conditions
Condition Permissible range
Ambient temperature -40…+70°C
Transportation and storage -40…+70°C
Relative humidity up to 80 % (at +25°C, non-condensing)
Altitude
up to 2000 m ASL
Vibration / shock resistance conforms to IEC 61131-2
EMC emission / immunity conforms to IEC 61131-2

Configuration
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
7
4. Configuration
The device parameters can be set with akYtecToolPro or in the Slave mode by commands from a network
Master.
The complete parameter list is presented in Appendix B. You can also read it out from the device using the
toolbar item Parameter list in akYtecToolPro.
Parameter groups:
−RS485 interface (Sect. 4.2)
−Device settings (Sect. 4.7)
oModbus Master (Sect. 4.5)
oModbus Spy (Sect. 4.6)
oModbus common (Sect. 4.3)
oDisplay (Sect. 4.7.1)
oDisplayed value (Sect. 4.7.2)
oExtended control (Sect. 4.7.3)
−Device status (Sect. 4.8)
Configuration order:
−Establish connection to the akYtecToolPro software (Sect. 4.1)
−Select the operation mode (Slave, Master or Spy) in the parameter Device settings > Operation
mode
−Set the common communication parameters: in the groups RS485 interface and Modbus common
−Set the parameters of the selected mode
−Set the display parameters
4.1 Connection to akYtecToolPro
The connection to akYtecToolPro software running on the PC can be established over the Micro-USB inter-
face. The main power supply is not required.
To configure the device:
– Connect the Micro-USB programming connector on the device (Fig. 2.1. Pos. 1) to PC over a USB-
to-Micro-USB connection cable (not included).
– Start akYtecToolPro.
– In a new project, click the toolbar item Add devices .
– In the open dialog, select the interface STMicroelectronics Virtual COM Port.
– Select the protocol akYtec Autodetection Protocol.
– Select Find device and click Search (device address is 1 and cannot be changed).
– If the correct device is found, select it and click the button Add devices to add the device to the pro-
ject.
– If the device is password protected, enter the correct password.
If you forgot the password, restore the factory settings (Sect. 4.9, 6).
4.2 RS485 interface
The parameters in this group define the physical layer of data exchange over the RS485 port for all operating
modes.

Configuration
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
8
Table 4.1 RS485 interface
Parameter Description Range
Default
value Access
Baud rate
Data transfer speed in bits per second
2400…115200
9600
RW
Data bits
Length of frames sent over Modbus network
8
8
RW
Stop bits
Number of stop bits
1 / 2
1
RW
Parity Error detection
none /
even /
odd
none RW
Silent interval
IDLE frame
- message frames are separated by
a silent interval of at least 1-character time.
t3.5 - message frames are separated by a silent
interval of at least 3.5-character time (Modbus
standard).
IDLE frame
/ t3.5
IDLE
frame RW
4.3 Modbus common
Open the node Device settings > Modbus common.
The parameter Address in Slave mode in this node is relevant only for the Slave mode. Other parameters
are common for all modes.
Table 4.2 Modbus common
Parameter Description Range
Default
value
Access
Address in Slave
mode
Device address in the Slave mode 1...255 1 RW
Byte order Inverse byte / register order of the re-
ceived variable (Example 1)
Unchanged /
Swap bytes /
Swap registers /
Swap bytes and
registers
Unchanged RW
Safe state timeout
Safe state activation delay after inter-
ruption of data transmission
0…60 s 0 RW
Safe state display
bitmask
Image displayed in the safe state (HEX
input)
0…FFFFFFFF 70404046 RW
Safe state color Display color in the safe state
Green /
Red /
Yellow
Green RW
Safe state blinking
Display blinking in the safe state
On / Off
Off
RW
Example 1: Parameter Byte order
Initial byte order
Parameter value
Final byte order
0xAABBCCDD
Unchanged
0xAABBCCDD
0xAABBCCDD
Swap bytes
0xBBAADDCC
0xAABBCCDD
Swap registers
0xCCDDAABB
0xAABBCCDD
Swap bytes and registers
0xDDCCBBAA

Configuration
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
9
4.3.1 Safe state
Safe state is a state of the display after communication interruption, activated with the time delay (Safe state
timeout, Tab. 4.2). In the safe state, a variable of type IMAGE (Safe state display bitmask, Tab. 4.2) is
displayed.
If Safe state timeout is set to 0, the device does not enter the safe state and displays the last received val-
ue.
After power-on, the device is in the safe state until a valid request is received.
4.4 Modbus Slave
Set the parameter Device settings > Operation mode to SLAVE (Tab. 4.5).
In the Slave mode, the device receives data from the Master. The exchange protocol (Modbus RTU or Mod-
bus ASCII) is detected automatically.
The parameter Modbus common > Address in Slave mode defines the device address (Tab. 4.2).
NOTE
Saving of configuration parameters to flash memory
– The configuration parameters are all writable parameters, except those in the node Dis-
played value.
– The number of flash memory write cycles is limited (≥10000 cycles). Therefore, frequent
(cyclic) saving of configuration parameters is not recommended.
– If the new configuration parameters are not written to the flash memory, they will be lost
after turning off the device. After powering on, the device will start with the parameter values
previously stored in the flash memory.
– In case of configuration over Micro-USB interface, the configuration parameters are saved to
the flash memory.
– In case of configuration over RS485 interface, the configuration parameters are not automat-
ically saved to the flash memory. If it is necessary, the user has to do it manually, calling the
command Save-to-Flash Trigger (Tab. 4.5). The command is a single pulse , that triggers
on rising edge the saving of the configuration parameters to the flash memory.
– During the recording of configuration parameters, the brightness of the display decreases by
50% and the response time of the device increases for a short time up to 200 ms. This
should be considered when setting the timeout in the Master device.
– To estimate the remaining number of write cycles in %, use the parameter Device status >
Remaining flash write cycles (Tab. 4.10).
4.5 Modbus Master
Set the parameter Device settings > Operation mode to MASTER (Tab. 4.5).
In the Master mode, only one Slave device can be connected. The Master device sends requests with a
reading function to the Slave at a certain frequency. After each request, the Master waits for response from
the Slave for a predetermined time interval (Response timeout, Tab. 4.3). The received variable will be
displayed.
If no response is received within the response timeout, the Master sends the next request and starts the
Safe state timeout countdown (Tab. 4.2). If there is no response from the Slave during Safe state timeout,
the Master switches to the safe state (Sect. 4.3.1).

Configuration
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
10
Table 4.3 Modbus Master
Parameter Description Range
Default
value
Access
Protocol
Data transmission protocol
RTU / ASCII
RTU
RW
Target device address
Address of Slave as data source
1…255
1
RW
Response timeout
Time the Master waits for response from
the Slave
300…10000 ms 1000 RW
Modbus function
Function in the request
0x03 / 0x04
0x03
RW
Start register
Address of the initial register in request.
The number of requested registers de-
pends on the selected data type (Sect.
4.7.2)
0…65535 0 RW
Request period
Period of Master request
100…65535 ms
200
RW
4.6 Modbus Spy
Set the parameter Device settings > Operation mode to SPY (Tab. 4.5).
In the Spy mode, the device "listens" to the RS485 interface, waiting for requests with the specified parame-
ters (Tab. 4.4). If a request with the specified parameters is detected, the variable in this request is dis-
played.
The exchange protocol (Modbus RTU or Modbus ASCII) is automatically detected.
Table 4.4 Modbus Spy
Parameter Description Range
Default
value
Access
Target device address
(1) (2)
Address of Slave as data source
0…255
1
RW
Modbus function Function in the request
0x03 / 0x04 /
0x06 / 0x10
0x04 RW
Start register (3)
Address of the initial register in request.
The number of requested registers de-
pends on the selected data type (Sect.
4.7.2)
0…65535 1 RW
(1) Target device address and the device address specified in the parameter Modbus common > Address
in Slave mode must be different.
(2) If Target device address = 0, the device monitors broadcast packets from the Master. Connecting sev-
eral Spy devices with the Target device address = 0 to the network, you can display different data on differ-
ent devices by specifying the Start register corresponding to the desired data for each device.
(3) The register address must be within the range of registers in request:
[;  +  1] ;  + 1(4.1)
where
SRSPY – in parameter Start register specified register
QTYPE – number of registers occupied by a variable, depending on its type
SRREQ – start register specified in request
QREQ – number of registers specified in request (Example 2)
Example 2
If SRREQ = 40 and QREQ = 20 are specified in the request, registers from 40 to 59 are requested. For different
variables, the following reactions are expected:
−SRSPY = 59, INT variable (QTYPE = 1) – the received variable is displayed
−SRSPY = 59, DINT variable (QTYPE = 2) – the received variable is not displayed because the data
from registers 59 - 60 is required, but register 60 is not requested

Configuration
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
11
4.7 Device settings
The first parameter to be set in this group is Operation mode. It defines the behavior of the device in the
network.
The flowchart that describes the display behavior depending on other parameters is shown in the Fig. 4.1.
Fig. 4.1 Display operation flowchart

Configuration
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
12
Table 4.5 Device settings
Parameter Description Range
Default
value Access
Operation
mode Operation mode in Modbus network
MASTER /
SLAVE /
SPY
SLAVE RW
Save-to-Flash
Trigger
Command used to trigger the saving of the configura-
tion parameters to the flash memory (Sect. 4.4)
0 / 1 0 RW
4.7.1 Display
The parameters in this node determine how the variable is displayed.
Table 4.6Display
Parameter Description Range
Default
value
Access
Data type Type of variable to display
INT / UINT /
DINT / UDINT /
REAL / STRING /
IMAGE / TIME
INT RW
Color
Display color. Can be affected also by Safe
state (Sect. 4.3.1) or Extended control (Sect.
4.7.3)
Green /
Red /
Yellow
Green RW
Brightness
Display brightness
0…100 %
75
RW
Leading zeros
Number of leading zeros before the first signif-
icant digit (integer variables only, Offset = 0,
Factor = 1) (Example 3)
0 / 1 / 2 / 3 0 RW
Decimal point
position
Position of the decimal point on the display
(integer and floating-point variables only) (Ex-
ample 4)
----
---.-
--.--
-.---
---- RW
Offset (1)
The variable is increased by Offset before
being displayed (integer and floating-point
variables only). If Offset ≠0, an integer will be
converted to a floating-point (Example 5)
-999…9999 0 RW
Factor (1)
The variable is multiplied by the
Factor
before
being displayed (integer and floating-point
variables only). If Factor ≠0, an integer will be
converted to a floating-point (Example 6)
-999…9999 1 RW
Blinking
Enable display blinking. Can be affected also
by Safe state (Sect. 4.3.1) or Extended control
(Sect. 4.7.3)
On / Off Off RW
Blinking period
Display blinking period (50 % duty cycle)
250…3000 ms
1000
RW
Display mode (2) Display mode selection
Static /
Text ticker /
Number ticker
Static RW
Tick time
Time interval with which the displayed variable
is shifted one position to the left
100…1500 ms 100 RW
(1) Using an offset or factor may cause the value to go out of range for the selected data type. Out-of-range
error will be displayed (Tab. 4.11).
(2) - In the Static mode, the value does not move across the display.
- In the Text ticker mode, the value is scrolled left continuously, character by character.
- In the Number ticker mode, the values of types INT, UINT, DINT, UDINT and REAL are displayed
without range check (-999… 9999). In this way, values with a number of digits greater than 4 can be dis-

Configuration
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
13
played. The precision of floating-point values (REAL) in this case is limited to 3 decimal places. If the to-
tal number of digits does not exceed 4, the value is displayed as in the Static mode.
Example 3
Displaying the integer "1" with different values of Leading zeros:
Leading zeros = 0: 1
Leading zeros = 1: 01
Leading zeros = 2: 001
Leading zeros = 3: 0001
Example 4
Displaying the integer "5000" with different values of Decimal point position:
Decimal point position = ----: 5000
Decimal point position = ---.-: 500.0
Decimal point position = --.--: 50.00
Decimal point position = -.---: 5.000
Displaying the floating-point "1.234" with different values of Decimal point position:
Decimal point position = ----: 1.234
Decimal point position = ---.-: 1.2
Decimal point position = --.--: 1.23
Decimal point position = -.---: 1.234
Example 5
Displaying the integer "5" with different values of Offset:
Offset = 1.0: 6.000
Offset = -1.0: 4.000
Offset = 5.0: 10.00
Offset = -5.0: 0.000
Displaying the floating-point "5.678" with different values of Offset:
Offset = 1.0: 6.678
Offset = -1.0: 4.678
Offset = 5.0: 10.67
Offset = -5.0: 0.678
Example 6
Displaying the integer "5" with different values of Factor:
Factor = 1.0: 5
Factor = -1.0: -5.00
Factor = 5.0: 25.00
Factor = -5.0: -25.0
Displaying the integer "5.678" with different values of Factor:
Factor = 1.0: 5.678
Factor = -1.0: -5.67
Factor = 5.0: 28.38
Factor = -5.0: -28.3
4.7.2 Displayed value
To test how variable will be displayed:
−select Data type in the node Device settings > Display
−open the node Device settings > Displayed value, set the test value of the selected data type in
the corresponding row and click the toolbar icon Write parameters

Configuration
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
14
−check the desired value on the display
For data type descriptions see Table 4.7.
For segment addressing for the data type IMAGE see Table 4.8.
Table 4.7Displayed value
Parameter Description
Size
Range
Default
value
Ac-
cess
registers
bytes
INT
Signed integer
1
2
-32768…32767
0
RW
UINT
Unsigned integer
1
2
0…65535
0
RW
DINT Signed integer 2 4
-2147483648…
2147483647 0 RW
UDINT
Unsigned integer
2
4
0…4294967295
0
RW
REAL
Floating-point number, sin-
gle-precision (IEE 754) 2 4
-3.402823E+38…
3.402823E+38 0 RW
STRING (1)
String of 2…16 characters
(Latin alphabet, numbers,
point)
2…16 4…32 - - RW
String length
Length of String variable
1
1
4…32
4
RW
IMAGE (2)
Bitmask of display segments
(HEX) 2 4 0…FFFFFFFF 0 RW
TIME (3)
Time in format XX:YY
2
4
5999
0
RW
(1) The parameter String length determines the length of string in Master and Spy modes.
In the Slave mode, String length is assumed to be 32 characters (16 registers). The data size of 16 reg-
isters must be specified in the Master request; read / write of a string fragment is not possible.
In the Slave mode, the number of characters specified in String length will be displayed in Text ticker
mode.
(2) For variables of IMAGE type, the correspondence of the bits in the mask to the display segments is
shown in Table 4.8. The least significant byte of the mask corresponds to the rightmost digit. The input is
in hexadecimal format.
(3) The displayed value XX:YY is calculated using integer division. The integer variable N is divided by 60.
XX = N / 60 (integer quotient), YY = N / 60 (remainder). If N = 1000, 16:40 is displayed.
Table 4.8Addressing of display segments
Segment
Bit
A
7
B
6
C
5
D
4
E
3
F
2
G
1
DP
0
4.7.3 Extended control
Extended control can be used only with integer and floating-point variables.
With extended control, you can divide the valid range of displayed variable into zones (up to 5). A display
color and a blinking option can be selected for each zone. Additionally, a value upper limit and a hysteresis
can be set for zones 1…4.
Open the node Device settings > Extended control.

Configuration
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
15
Table 4.9 Extended control
Parameter Description Range
Default
value
Access
Enable
Enable extended control for all zones
On / Off
Off
RW
Zone 5
Color Display color when variable is within the zone
Green /
Red /
Yellow
Green RW
Blinking
Display blinks when variable is within the zone
On / Off
Off
RW
Zone 1…4
Enable
Enable extended control for the zone
On / Off
Off
RW
Upper limit (1)
Zone upper limit
-999…9999
0
RW
Hysteresis (2)
Value relative to the upper limit of the zone, after
decreasing below which:
- current zone becomes active again
(if Upper limit > 0)
- the next zone becomes active
(if Upper limit < 0)
0…9999 0 RW
Color Display color when variable is within the zone
Green /
Red /
Yellow
Red RW
Blinking Display blinks when variable is within the zone On / Off
Off (2, 4)
On (1, 3)
RW
(1) If multiple zones are used, the Upper limit of the higher numbered zone must be greater than the Upper
limit of the lower numbered zone: ULZ1 < ULZ2 < ULZ3 < ULZ4. Otherwise, an error message is displayed
(Tab. 4.11). The Upper limit of the zone 5 is not specified and is assumed to be equal to the upper limit
of the whole valid range (9999).
(2) The Hysteresis cannot be greater than the difference between the Upper limits of adjacent zones, oth-
erwise the device displays an error message (Tab. 4.11). There is no Hysteresis in the zone 5, since
this zone is the highest on the number line.
For practical use see examples 7-12:
Example 7. Extended control with one zone
Zone 5:
Range -999…9999
Color green
Blinking off
If the variable is changed, the visual parameters do not change.
Example 8. Extended control with two zones, ULZ1 > 0
Zone 1
Upper limit: 100
Hysteresis: 10
Color: green
Blinking: off
Zone 5
Upper limit: 9999
Color: yellow
Blinking: on

Configuration
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
16
If the variable is increased, the zone 1 is active in the range [-999; 100), the zone 5 – in the range [100;
9999].
If the variable is decreased, the zone 1 is active in the range [-999; 90), the zone 5 – in the range [90; 9999].
Example 9. Extended control with two zones, ULZ1 < 0
Zone 1
Upper limit: -100
Hysteresis: 10
Color: green
Blinking: off
Zone 5
Upper limit: 9999
Color: yellow
Blinking: on
If the variable is increased, the zone 1 is active in the range [-999; -90], the zone 5 – in the range (-90;
9999].
If the variable is decreased, the zone 1 is active in the range [–999; -100), the zone 5 – in the range [-100;
9999].
Example 10. Extended control with three zones, ULZ1 > 0, ULZ2 > 0
Zone 1
Upper limit: 100
Hysteresis: 10
Color: green
Blinking: off
Zone 2
Upper limit: 150
Hysteresis: 20
Color: yellow
Blinking: on
Zone 5
Upper limit: 9999
Color: red
Blinking: off
If the variable is increased, the zone 1 is active in the range [-999; 100), the zone 2 – in the range [100;
150), the zone 5 – in the range [150; 9999].
If the variable is decreased, the zone 1 is active in the range [-999; 90), the zone 2 – in the range [90; 130),
the zone 5 – in the range [130; 9999].

Configuration
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
17
Example 11. Extended control with three zones, ULZ1 < 0, ULZ2 < 0
Zone 1
Upper limit: -150
Hysteresis: 20
Color: green
Blinking: off
Zone 2
Upper limit: -100
Hysteresis: 10
Color: yellow
Blinking: on
Zone 5
Upper limit: 9999
Color: red
Blinking: off
If the variable is increased, the zone 1 is active in the range [-999; 130], the zone 2 – in the range
(-130; -90], the zone 5 – in the range (-90; 9999].
If the variable is decreased, the zone 1 is active in the range [-999; -150), the zone 2 – in the range
[-150; -100), the zone 5 – in the range [-100; 9999].
Example 12. Extended control with three zones, ULZ1 < 0, ULZ2 > 0
Zone 1
Upper limit: -100
Hysteresis: 10
Color: green
Blinking: off
Zone 2
Upper limit: 100
Hysteresis: 10
Color: yellow
Blinking: on
Zone 5
Upper limit: 9999
Color: red
Blinking: off
If the variable is increased, the zone 1 is active in the range [-999; -90], the zone 2 – in the range (-90; 100),
the zone 5 – in the range [100; 9999].
If the variable is decreased, the zone 1 is active in the range [-999; -100), the zone 2 – in the range [-100;
90), the zone 5 – in the range [90; 9999].
4.8 Device status and errors
The status of the device can be read in the group Device status (Tab. 4.10).
The displayed errors are listed in the Table 4.11.
Table 4.10 Device status
Parameter
Description
Range
Default value
Access
Status
32-bit status code
0…4294967295
−
R
Remaining flash
write cycles
Remaining flash memory write cycles
in %
0…100 % −R

Configuration
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
18
Table 4.11 Displayed errors
Displayed error Description
Bit number in
Status register
ErrL
Variable is below the lower limit for the selected data type
27
ErrH
Variable is above the upper limit for the selected data type
28
ErrZ
The Upper limit of the zone with a higher number is equal or less
than the
Upper limit
of the zone with a lower number 26
The Hysteresis is greater than the difference between the Upper
limits of adjacent zones
Safe state display
bitmask
Display timeout exceeds the sum of Response timeout (Tab. 4.2)
and the subsequent Safe state timeout (Tab. 4.3)
-
4.9 Password
You can use password to protect the configuration parameters of the device from an unauthorized access
over akYtecToolPro.
To set the password, use the toolbar item Password or the same item in the device context menu.
There is no password by default.
If you forgot the password, restore the factory settings (Sect. 6).

Installation
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
19
5. Installation
The safety requirements from the Section 1.5 must be observed.
NOTE
Before mounting, it is recommended to configure the device over the Micro-USB interface (Sect. 4).
5.1 Mounting
The device is designed for switch panel mounting in a borehole of Ø22.5 mm.
To prevent the device spinning in the borehole, make a special cut-out according to Fig. 5.3.
Mounting sequence:
−Apply the included gasket on the rear surface of the display.
−Insert the device into the cut-out and tighten the nut from the rear side of the switch panel.
−Plug the terminal block in one of the two plug positions.
−Connect the power and signal cables in accordance with Sect. 5.2.
Fig. 5.1 External dimensions Fig. 5.2 Mounting
Fig. 5.3 Cut-out dimensions